Year	Number
2004-01-01	24524
2005-01-01	21951
2006-01-01	19199
2007-01-01	17194
2008-01-01	18962
2009-01-01	24801
2010-01-01	24709
2011-01-01	33538
2012-01-01	39940
2013-01-01	46793
2014-01-01	54159
2015-01-01	57854
2016-01-01	61913